Filter
Top Products
288
5.4.2 External wiring
(1) Q64TCTTN
(a) In the standard control
*1 Use the shielded compensation lead wire.
*2 Use the shielded cable.
Use the compensation lead wire for the cable of thermocouple. If the compensation lead wire is not used, and when the cold
junction temperature compensation resistor is away from the end tip of thermocouple, the (ambient) temperature difference
may lead to a faulty temperature process value (PV).
L1
L2
L4
COM-
24VDC
Q64TCTTN
CH1+
CH1-
CH2+
CH2-
CH4+
CH4-
Controlled
object
Filter
Filter
Filter
Internal
circuit
Internal
circuit
Internal
circuit
*1
*1
*2
*2
Q64TCTT(BW)N
Reference junction
Thermocouple extension wire (OK)
Shielded cable (NG)
Cold junction
temperature
compensation
resistor
(Ambient) temperature difference
Terminal block
A: Reference junction of the
thermocouple
B: Cold junction temperature
compensation resistor
A
B